feat: extract contacts from message logs

docs/source-discovery/capability-source-matrix.md

@@ -18,7 +18,7 @@ Schema notes: `docs/source-discovery/2026-07-09-n12-pre-zyl-schema-notes.md`
 | MCP tool | Primary source | Fallback source | Evidence file | Decision status | Next implementation slice |
 | --- | --- | --- | --- | --- | --- |
 | `isphere_receive_messages` | decrypted `PacketReader.ProcessPacket` XMPP `<message>` stanzas via `internal/isphere.EncryptedPacketLogSource` | decrypted `Smark.SendReceive` transport stanzas; decrypted `SaveToDB` `Chat_OnMessageArrived` traces; wrapped `MsgLib.db` after DB wrapper is solved | `docs/source-discovery/2026-07-09-n12-pre-zyl-schema-notes.md#field-mapping-evidence` | C5 env loader wired through ISPHERE_PACKET_LOG_FILE; default source remains empty when unset | fixture-backed configured-source operator smoke |
-| `isphere_search_contacts` | decrypted packet/send-receive JIDs and later roster stanzas from `Smark.SendReceive` | `MsgLib.db` contact/conversation tables after DB wrapper is solved; UIA helper source if display names are missing | `docs/source-discovery/2026-07-09-n12-pre-zyl-schema-notes.md#log-decryption-result` | candidate pending parser coverage | second |
+| `isphere_search_contacts` | bare sender/receiver JIDs extracted from normalized log-backed messages | decrypted roster/contact stanzas from `Smark.SendReceive`; `MsgLib.db` contact/conversation tables after DB wrapper is solved; UIA helper source if display names are missing | `docs/source-discovery/2026-07-09-n12-pre-zyl-schema-notes.md#log-decryption-result` | C7 source extraction unit-verified with JID-only display/account fallback | register MCP tool from C7 source |
 | `isphere_search_groups` | decrypted XMPP group/message stanzas if groupchat/group JIDs appear | `MsgLib.db` group/conversation tables after DB wrapper is solved; UIA helper source if group display names are missing | `docs/source-discovery/2026-07-09-n12-pre-zyl-schema-notes.md#field-mapping-evidence` | candidate pending group stanza evidence | third |
 | `isphere_receive_files` | decrypted `PacketReader.ProcessPacket` file-transfer message stanzas plus `zyl\importal\<hash>` cache mapping | decrypted `Smark.SendReceive` and `SaveToDB` traces for file-reference reconciliation | `docs/source-discovery/2026-07-09-n12-pre-zyl-schema-notes.md#field-mapping-evidence` | candidate pending cache-reference mapping | fourth |
 

docs/superpowers/plans/2026-07-09-stage-c-log-backed-receive-messages-loop.md

@@ -929,7 +929,7 @@ Implemented and verified in this loop:
 - `Limit <= 0` returns all matches; positive `Limit` truncates.
 - This loop does not register the MCP tool yet; registration comes after source behavior passes tests.
 
-- [ ] **Step 1: Write failing contact extraction test**
+- [x] **Step 1: Write failing contact extraction test**
 
 Create `internal/isphere/contacts_test.go` and run:
 
@@ -939,11 +939,11 @@ go test ./internal/isphere -run TestSearchContactsFromMessagesMatchesBareJIDs -v
 
 Expected initial failure: contact search types/functions do not exist.
 
-- [ ] **Step 2: Implement contact extraction/search**
+- [x] **Step 2: Implement contact extraction/search**
 
 Create `internal/isphere/contacts.go` with minimal pure Go logic over normalized messages. Use synthetic/redacted fixtures only.
 
-- [ ] **Step 3: Run full verification and rewrite Loop C8**
+- [x] **Step 3: Run full verification and rewrite Loop C8**
 
 Run:
 
@@ -958,6 +958,71 @@ Expected: all exit 0. Remove any generated root `isphere-mcp.exe` after build. R
 
 ---
 
+## Loop C7 Result
+
+Implemented and verified in this loop:
+
+- `internal/isphere.SearchContactsFromMessages(messages, query)` extracts unique contact candidates from normalized message sender/receiver bare JIDs.
+- Contacts currently use bare JID as `ContactID`, `DisplayName`, and `Account`; `Source` is `local_readonly`, `Confidence` is `0.6`, and `RawRef` is `message_jid` until richer roster/display-name evidence is validated.
+- Query matching is case-insensitive over bare JID/display name and `Limit` truncates deterministic sorted results.
+- Verification completed for C7 with the loop-specific test; full verification is run again before commit.
+
+---
+
+## Loop C8: Register `isphere_search_contacts` MCP tool
+
+**Goal:** Register the contact search MCP tool on top of the C7 contact extraction behavior while keeping the tool read-only and clearly marked as JID-derived/local-readonly until richer contact evidence is available.
+
+**Planned files:**
+- Create: `internal/tools/isphere_contacts.go`
+- Create: `internal/tools/isphere_contacts_test.go`
+- Modify: `internal/mcpserver/server.go`
+- Modify: `internal/mcpserver/server_test.go`
+- Modify: `scripts/verify-go-mcp.ps1`
+- Modify: `docs/go-mcp-runbook.md`
+- Modify: `docs/current-status-card.md`
+- Modify: `docs/superpowers/plans/2026-07-09-stage-c-log-backed-receive-messages-loop.md`
+
+**Planned interface:**
+- Tool name: `isphere_search_contacts`.
+- Input: `query`, `limit`.
+- Source: contact extraction over the same env-configured message source used by `isphere_receive_messages`.
+- Output shape: `ok`, `contacts`, `next_cursor`, `audit` minimal fields aligned with `docs/mcp-core-tools-contract.md`.
+- Default empty source returns `ok: true`, `contacts: []`.
+
+- [ ] **Step 1: Write failing tool test**
+
+Create `internal/tools/isphere_contacts_test.go` and run:
+
+```powershell
+go test ./internal/tools -run TestISphereSearchContactsToolReturnsJIDContacts -v
+```
+
+Expected initial failure: contact tool registration does not exist.
+
+- [ ] **Step 2: Implement contact tool registration**
+
+Register `isphere_search_contacts` with source injection for tests. Use C7 source behavior and return a contract-shaped map with minimal audit metadata.
+
+- [ ] **Step 3: Wire server and verification**
+
+Register contact search in `mcpserver.NewServerWithReceiveSource` or an equivalent shared source path. Update server tool-count tests and `scripts/verify-go-mcp.ps1` to expect six tools and call `isphere_search_contacts` against both default empty source and synthetic configured fixture.
+
+- [ ] **Step 4: Run full verification and commit**
+
+Run:
+
+```powershell
+git diff --check
+go test ./...
+go build ./cmd/isphere-mcp
+powershell -NoProfile -ExecutionPolicy Bypass -File scripts/verify-go-mcp.ps1
+```
+
+Expected: all exit 0. Remove any generated root `isphere-mcp.exe` after build. Commit exact C8 paths only and rewrite the next loop from actual results.
+
+---
+
 ## Self-Review
 
 - Spec coverage: the plan follows the user's cyclic requirement: plan first, implement one loop at a time, update the next loop after each result, and ask only on blockers.

internal/isphere/contacts.go

@@ -0,0 +1,69 @@
+package isphere
+
+import (
+	"sort"
+	"strings"
+)
+
+type Contact struct {
+	ContactID   string
+	DisplayName string
+	Account     string
+	Source      string
+	Confidence  float64
+	RawRef      string
+}
+
+type SearchContactsQuery struct {
+	Query string
+	Limit int
+}
+
+type SearchContactsResult struct {
+	Contacts []Contact
+}
+
+func SearchContactsFromMessages(messages []Message, query SearchContactsQuery) SearchContactsResult {
+	unique := map[string]Contact{}
+	for _, message := range messages {
+		addMessageContact(unique, message.SenderID)
+		addMessageContact(unique, message.ReceiverID)
+	}
+
+	queryText := strings.ToLower(strings.TrimSpace(query.Query))
+	ids := make([]string, 0, len(unique))
+	for id := range unique {
+		if queryText == "" || strings.Contains(strings.ToLower(id), queryText) || strings.Contains(strings.ToLower(unique[id].DisplayName), queryText) {
+			ids = append(ids, id)
+		}
+	}
+	sort.Strings(ids)
+
+	limit := query.Limit
+	if limit <= 0 || limit > len(ids) {
+		limit = len(ids)
+	}
+	contacts := make([]Contact, 0, limit)
+	for _, id := range ids[:limit] {
+		contacts = append(contacts, unique[id])
+	}
+	return SearchContactsResult{Contacts: contacts}
+}
+
+func addMessageContact(unique map[string]Contact, id string) {
+	trimmed := strings.TrimSpace(id)
+	if trimmed == "" {
+		return
+	}
+	if _, exists := unique[trimmed]; exists {
+		return
+	}
+	unique[trimmed] = Contact{
+		ContactID:   trimmed,
+		DisplayName: trimmed,
+		Account:     trimmed,
+		Source:      "local_readonly",
+		Confidence:  0.6,
+		RawRef:      "message_jid",
+	}
+}

internal/isphere/contacts_test.go

@@ -0,0 +1,22 @@
+package isphere
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestSearchContactsFromMessagesMatchesBareJIDs(t *testing.T) {
+	messages := []Message{
+		{ID: "msg-1", SenderID: "alice@imopenfire1-lanzhou", ReceiverID: "bob@imopenfire1-lanzhou"},
+		{ID: "msg-2", SenderID: "alice@imopenfire1-lanzhou", ReceiverID: "carol@imopenfire1-lanzhou"},
+	}
+
+	got := SearchContactsFromMessages(messages, SearchContactsQuery{Query: "imopenfire1", Limit: 2})
+	want := SearchContactsResult{Contacts: []Contact{
+		{ContactID: "alice@imopenfire1-lanzhou", DisplayName: "alice@imopenfire1-lanzhou", Account: "alice@imopenfire1-lanzhou", Source: "local_readonly", Confidence: 0.6, RawRef: "message_jid"},
+		{ContactID: "bob@imopenfire1-lanzhou", DisplayName: "bob@imopenfire1-lanzhou", Account: "bob@imopenfire1-lanzhou", Source: "local_readonly", Confidence: 0.6, RawRef: "message_jid"},
+	}}
+	if !reflect.DeepEqual(got, want) {
+		t.Fatalf("SearchContactsFromMessages() = %#v, want %#v", got, want)
+	}
+}